Joseph Fiala (1754-1816) was a composer and performer of the classical period. His many compositions include manuscripts of a concerto for clarinet, taille, and orchestra in the Fürstlich Thurn und Taxis Hofbibliothek in Regensburg, West Germany and the Library of Congress in Washington, D.C. , U.S.A. This paper identifies the instrument called "taille" as the English horn and discusses the work in areas of form, harmony, rhythm, orchestration, and use of solo instruments. Comparison with contemporary works shows the piece is typical of the eighteenth-century symphonie concertante and, together with the composer's manuscript, provides a basis for editing of the solo parts.